SmartElex HX711 Load Cell Amplifier - High Precision Weight Sensor Module
HX711 Load Cell Amplifier (SmartElex)
Overview
High-precision load cell amplifier + ADC module
Based on HX711 24-bit Analog-to-Digital Converter
Converts tiny load cell signals digital data
Essential for building digital weighing systems
Compatible with Arduino, ESP32, Raspberry Pi
Working Principle
Load cell (strain gauge) produces very small analog signal (mV)
HX711 amplifies signal using PGA (Programmable Gain Amplifier)
Converts signal into 24-bit digital data
Microcontroller reads data via 2-wire interface (DOUT & SCK)
Eliminates need for external amplifier circuits
24-bit (high precision)
Operating Voltage: 2.7V 5V
Current Consumption: < 1.5 mA
Data Rate: 10 SPS / 80 SPS selectable
Gain Options: 32, 64, 128
Input Channels: 2 differential channels (A & B)
Output Type: Digital (2-wire serial)
Noise Rejection: 50Hz & 60Hz filtering
Pin Configuration
To Microcontroller
DT (DOUT) Data output
SCK (CLK) Clock
VCC 3.3V / 5V
GND Grounong> Excitation
A+ Signal +
A- Signal
Features
Ultra-high resolution (24-bit ADC)
Built-in Programmable Gain Amplifier (PGA)
Supports dual channel input
Low noise & stable readings
Simple 2-wire communication interface
Low power consumption
Applications
Digital weighing scales
Smart kitchen scales
Industrial weight measurement
Force measurement systems
Tank / hopper level monitoring
IoT-based weight monitoring
Usage Tips to reduce noise
Use shielded wires for better accuracy
Avoid vibration and external interference
Use averaging/filtering in code
Advantages
Very high precision (24-bit)
Low cost and widely available
Easy integration with microcontrollers
Stable readings with noise rejection
Limitations
Requires calibration for accurate weight
Slower sampling compared to some ADCs
Sensitive to electrical noise
Needs proper wiring (Wheatstone bridge)
Summary
A high-precision load cell amplifier module
Converts mV signals digital weight data
Uses HX711 24-bit ADC>
Ideal for DIY weighing scales and measurement systems